MEXICO CITY Ethan Couch, the Texas youth known as the "affluenza" teen for using his family's wealth as a defence for killing four people in a drunk driving incident in 2013, has dropped a legal challenge to his deportation to the United States from Mexico, a Mexican judicial source said on Tuesday.

Couch, 18, and his mother, Tonya, were arrested in Mexico last month following a more than two-week manhunt. His mother was deported to the United States last month.

The judicial source did not know when the youth would be returned to the United States.

Couch was sentenced to 10 years of drug-and-alcohol-free probation for intoxication manslaughter, a punishment condemned by critics as privilege rewarded with leniency. He now faces the prospect of charges in the United States for violating his probation.

During Couch's trial, a psychologist sparked outrage by saying in his defence that Couch was so wealthy and spoiled he could not tell the difference between right and wrong - hence, he was a victim of "affluenza."

(Reporting by Anahi Rama)

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